That said, technically, I'm not responsible for too much of what this theme is. I essentially, and with what is more than likely an element of irresponsibly (but with more responsibility than previous iterations of this theme), stitched it together from contributions of other people who are much smarter than I. However, I accept complete responsibility for any sloppiness I may have caused. And I'd love the opportunity to correct any mistakes should you find any. Please let me know.

A sample custom header implementation in inc/custom-header.php that can be activated by uncommenting one line in functions.php and adding the code snippet found in the comments of inc/custom-header.php to your header.php template.

Some small tweaks in inc/extras.php that can improve your theming experience.

A script at js/libs/navigation.js, which is includeed in the minified js/build/global.min.js script, that makes your menu a toggled dropdown on small screens (like your phone), ready for CSS artistry. The global script is enqueued in functions.php.

2 sample CSS layouts in layouts/ for a sidebar on either side of your content.

The option to "_sassify" was provided in the "Advanced Options" when initially generating the original underscores theme, meaning UIOFive is Sass capable, thereby providing smartly organized modules of styles. You'll find all the raw Sass files in the sass directory, they will help you to quickly get your design off the ground.

Grunt capable, and currently managing Sass and Javascript related assets.